Published:2012/11/21 21:33:00 Author:muriel | Keyword: FM Receiver
An FM regenerative receiver using a single FET and one audio amplifier IC. (View)
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Published:2012/11/21 21:32:00 Author:muriel | Keyword: 2 Transistor, Transmitter
A compact 2 transistor transmitter for use at VHF frequencies. (View)
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Published:2012/11/21 21:31:00 Author:muriel | Keyword: 6 x 6 , Loop Antenna
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Published:2012/11/21 21:31:00 Author:muriel | Keyword: AM voice transmitter
An AM voice transmitter with variable tuning. The antenna circuit is also tuned and transmits via a long wire antenna. Please Note. It is illegal to transmit on the AM wavebands in most countries, as such this circuit is shown for educational purposes only. (View)
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Published:2012/11/21 21:29:00 Author:Ecco | Keyword: Optical fibre, transmitting data , coupling circuit
The circuit shown in figure firstly converts input analog signal to frequency signal by V/F voltage-frequency converter, then it is sent to to optical fibers by light-emitting diodes. Length of optical fibre or polystyrene is decided by isolation voltage between digital or analog signal input end and photodiode.
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Published:2012/11/21 21:30:00 Author:muriel | Keyword: Bug Detector
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Published:2012/11/21 21:22:00 Author:Ecco | Keyword: simple modulator , symbol generator , display
Illustrating the the LM1889 integrated chip demodulator circuit , few external components required. LM1889 is a dedicated circuit used as the interface element of TV antenna terminal for audio, color, contrast and brightness video modulation. And it is used as demodulator circuit here for displayed signal generator.
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Published:2012/11/21 21:15:00 Author:Ecco | Keyword: Zhenyu , electronic disinfecting cabinet, ozone generator
The ozone generator is the core circuit of the disinfection cabinet, while the core element is ozone glass tubes Q1 and Q2. And they form the ozone generating circuit with bidirectional thyristor VS and boost transformer T. When the AC power supply is in the negative half cycle, the diode VD3 gets conduction, VD4 is deadline, VS is turned off, then the power is charging for C9, and charging current flowing direction is AC power supply L side → R11 → L1 → C9 → N terminal. When the power supply is in the positive half cycle, VD3 is cut off, VD4 gets conduction, VS gets conduction, and the sufficient charge C9 makes instantaneous discharge through L1 → VS, then L1 generates larger transient discharge current induction in L2 and higher induced voltage.
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Published:2012/11/21 21:05:00 Author:Ecco | Keyword: Refrigerator, automatic protector
BT33 forms a delay circuit. When the power is turned on, the relay J1 does not work, contact J1-2 disconnects for five minutes, due to the charging voltage rise of the capacitor C1, BT33 gets conduction, relay J1 pulls, J1 -2 contact gets closure, then the refrigerator gets power, which is protected by J1-1 normally open contact. Under the case with normal voltage, D2, BG2 get conduction, D3, and D4, and BG3 are cutoff, relay J2 does not work.
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Published:2012/11/21 20:48:00 Author:Ecco | Keyword: motor overheating, language newspaper called
It is composed of temperature sensor, electronic switch circuit and language utterance circuit. When motor fails to run in the hot season or at room temperature, the motor will often appear overheating. The circuit can issue the sound of beep , please note to remind duty personnel.
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Published:2012/11/21 21:29:00 Author:muriel | Keyword: ATL-3 Loop Antenna
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Published:2012/11/21 21:29:00 Author:muriel | Keyword: 450-800MHz , UHF Preamplifier
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Published:2012/11/21 21:27:00 Author:muriel | Keyword: low power , FM Transmitter
An low power FM Transmitter using an op-amp as the audio preamp and a single transistor as the RF amplifier. (View)
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Published:2012/11/21 21:24:00 Author:muriel | Keyword: 4 Transistor, Transmitter
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Published:2012/11/21 21:23:00 Author:muriel | Keyword: Simple , Field Strength Meter
This Field Strength Meter is simple and also quite sensitive. It uses an ordinary digital voltmeter to measure RF signal strength up to a few hundred MHz. (View)
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Published:2012/11/21 21:22:00 Author:muriel | Keyword: Field Strength Meter
This is a wide band signal strength meter circuit which responds to small changes in RF energy, designed to be used for the VHF spectrum and will respond to AM or FM modulation or just a plain carrier wave. (View)
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Published:2012/11/21 21:22:00 Author:muriel | Keyword: FM voice transmitter, Band 2 VHF
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Published:2012/11/21 21:16:00 Author:muriel | Keyword: 2 Transistor, FM Transmitter
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Published:2012/11/21 21:15:00 Author:muriel | Keyword: SW Receiver , ZN414
A Short Wave Receiver based on the MK484 (formerly ZN414) that includes the tropical bands and 49 metre bands. (View)
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Published:2012/11/21 21:15:00 Author:muriel | Keyword: ZN414 , Portable Receiver
An AM portable radio receiver made from the ZN414 IC. The ZN414 ic has now been replaced by the MK484 which is identical in performance and pinout. (View)
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